CN104564256B - Exhaust system for the reducing agent supply unit of selective catalytic reduction system operating - Google Patents
Exhaust system for the reducing agent supply unit of selective catalytic reduction system operating Download PDFInfo
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- CN104564256B CN104564256B CN201410574581.XA CN201410574581A CN104564256B CN 104564256 B CN104564256 B CN 104564256B CN 201410574581 A CN201410574581 A CN 201410574581A CN 104564256 B CN104564256 B CN 104564256B
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- valve
- injector
- pumping mechanism
- fluid
- conduit
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
- F01N2610/144—Control thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The present invention relates to the exhaust system of the reducing agent supply unit for selective catalytic reduction system operating.One kind discharge program, it is a part for injector, the injector may be used as reducing agent supply unit (RDU) part, and wherein RDU is the part for spraying the selective catalytic reduction system operating of diesel exhaust gas fluid into gas extraction system, to control exhaust emissions.RDU is delivered to engine exhaust system by agent carrier is reduced.Discharge process includes control strategy, and it is improving the quality of discharge cycle (that is, the Fluid Volume for increasing discharge).The sequence of discharge event is adjusted, this strengthens the efficiency of discharge by increasing through the initial flow of injector to generate powerful vacuum in fluid supplies road and injector.However, when opening injector, the pressure in fluid path increases to the level of the environmental pressure slightly less than outside injector, therefore gas flow is greatly reduced.
Description
Technical field
The present invention generally relates to the alternatively reducing agent supply unit of a part for property catalyst reduction system
Discharge program.
Background technology
The new Abgasgesetz in Europe and North America, which drives, implements new exhaust after treatment system, particularly for lean burn technology
, such as compression ignition (diesel oil) engine, and stratified charge spark ignition engine (being usually directly to spray), it is dilute
Operated under thin and super sloppy condition.Lean-combustion engine shows high-caliber nitrogen oxides emission (NOx), its richness in lean burn
It is difficult to handle in oxygen exhaust environment characteristic.Exhaust gas aftertreatment techniques currently are developed, it handles NOx under such conditions.
One of these technologies include catalyst, and it promotes ammonia (NH3) reacted with Vent Oxidation nitrogen (NOx), to produce nitrogen (N2)
With water (H2O).The technology is referred to as SCR (SCR).Ammonia is difficult in the respective pure form in automotive environment at which
With processing, thus these systems it is usual be aqueous urea solution using liquid, urea (CO (NH2)2) concentration be generally
32%.The solution is referred to as AUS-32, and is also known with its commercial designations AdBlue.Urea sprays generally by use
Device is transported to flow of hot exhaust, and is converted into ammonia before entering in catalyst.More specifically, urea is transported to thermal exhaust
Stream, and it is changed into ammonia in exhaust after experience is pyrolyzed, or thermal decomposition is ammonia and isocyanic acid (HNCO).Then isocyanic acid is being arranged
Experience hydrolysis, and be changed into ammonia and carbon dioxide (CO in the case of water is deposited in gas2), and the ammonia from pyrolysis and hydrolysis is right
Undergo the catalytic reaction with nitrogen oxide as described earlier afterwards.
AUS-32 or AdBlue has -11C freezing point, and expection can occur system and freeze in cold climate.Because
These fluids are aqueous, so volumetric expansion occurs after solid-state is transitioned into when freezing.The ice so expanded can be such as
Apply obvious action power in any closing space such as injector or fluid supply tube.The expansion may cause to damage to injection unit
It is bad, therefore, spraying system discharge spray unit typically in tail-off, fluid therein is contained in remove.
In known system construction, injector, which discharges, to be used for when without using injector from injector removing fluids.
It is found out that the efficiency of this method is not 100%, i.e. a certain amount of fluid can be remained in sprayer unit.Although residual
Fluid Volume may not always be enough to cause to damage injector when freezing and (can obtain swelling volume for the ice of expansion), still
Also risk be present, i.e., during engine hot dipping, the fluid of residual can be exposed to high temperature.The high temperature exposure may cause AUS-
32 are decomposed, and it can also be caused to damage to injection unit.
In other types of design, it has been found that, the fluid of residual tends to be gathered in the top of injector, is in
In space between filter and inlet tube.The injector of many types has O-ring, and it is used together with injector cup, to carry
For sealing property, and prevent residual fluid from leaking.However, in some injectors, it is understood that there may be AUS-32 is passed through and injector
Cup cooperation with provide sealing property installation O-ring leakage paths.Although the sealed pathway generated by O-ring is typically sufficient
To deal with liquid, however, it has been found that, it is such close that AUS-32 solution is easy to the destruction in the form of creep urea crystal
Envelope.At fluid boundary layer, bypass, then fluid evaporator and leave in its solid forms if there is the minimum of seal nipple
Urea.This provides wicking path to be used for more liquid urea solution, and it establishes another boundary layer, evaporates and leaves more
Solid urea.The creep mechanism usually observes in AUS-32 systems.
Accordingly, it is desirable to a kind of method discharges RDU, thus from RDU fully removing fluids, and reduce or prevent such as with
The creep mechanism of upper description.
The content of the invention
The discharge program (purge procedure) of the present invention is a part for injector, and the injector may be used as
A part for reducing agent supply unit (RDU), wherein RDU is for spraying diesel exhaust gas fluid (DEF) into gas extraction system
The part of SCR (SCR) system, and for controlling exhaust emissions.
RDU will reduce agent carrier (such as aqueous urea solution) and be delivered to engine exhaust system.The solution is changed into ammonia,
Itself and then reaction of nitrogen oxides in catalytic environment with discharge, to generate nitrogen and H2O.A type of urea, commercially
Referred to as AdBlue, with -11 DEG C of freezing point.In order to prevent the parts damages during frozen state, AdBlue spraying systems lead to
Discharge (purging) is crossed from injector removing fluids.The present invention improves RDU discharge efficiency.
In one embodiment, the present invention is a kind of system for exhaust ejector, and it includes：With multiple operation moulds
The pumping mechanism of formula；The injector being in fluid communication is in the pumping mechanism；With the valve of the part as the injector
Portion, wherein the valve portion has open position and closed position.The pumping mechanism is arranged on first operator scheme, so as to described
Pumping mechanism directs pressurized fluid to the injector, and the valve portion changes between an open position and a closed,
Optionally to distribute fluid into exhaust flow path.The pumping mechanism can also be arranged on second operator scheme, so as to
The pumping mechanism generates vacuum when the valve portion is in the closed position, and the pumping mechanism is in open position in valve portion
Fluid is guided to leave injector when putting.
In another embodiment, system of the invention includes：For transmitting the pumping mechanism of fluid；Injector；As spray
The valve portion of a part for emitter, wherein the valve portion can move between open position, closed position and any position therebetween；
And drain valve, it is in pumping mechanism and injector is in fluid communication.The drain valve is arranged on the first construction, so as to the row
Valve is put to guide pressure fluid to the injector from the pumping mechanism.The drain valve is arranged on the second construction, with toilet
State pumping mechanism and vacuum is generated when the valve portion is in the closed position, and the drain valve is in institute in the valve portion
Fluid is guided to the pumping mechanism from the injector when stating open position.
The drain valve includes Part I and is connected to the Part II of Part I.When the drain valve is in described
During the first construction, the pumping mechanism guides fluid to pass through the pumping mechanism, through described second from the Part I
Divide and reach the injector.When the drain valve is in the described second construction, the pumping mechanism guiding fluid passes through institute
State Part I and leave the injector through the pumping mechanism.
The discharge process of the present invention includes control strategy, and it (that is, increases from RDU and arranged to improve the quality of discharge cycle
The Fluid Volume gone out).The sequence of discharge event is adjusted, to generate powerful vacuum in fluid supplies road and injector -- this
Strengthen the efficiency of discharge by increasing through the initial flow of injector.However, when opening injector, in fluid path
Pressure increases to the level of the environmental pressure slightly less than outside injector, therefore gas flow is greatly reduced.
The discharge process of the present invention includes multiple vacuum formation sequences during discharge event.Initially, pumping mechanism and row
Control valve is put to be activated (or in alternative embodiments, pumping mechanism is activated with " reverse " pattern), and the valve portion of injector
Remain turned-off.After the scheduled time is reached, or if achieving predetermined vacuum level, then the valve portion of injector is opened.
The valve portion of injector was stayed open up to the scheduled time, or until pressure rises to predeterminated level.
Then it is multiple the circulation can be repeated as needed.Therefore it is an object of the invention to make from injector discharge
Fluid volume maximizes.Born it is a further object of the present invention to provide additional sealing barrier to reduce the sealing of existing potted component
Lotus.It is another object of the present invention to increase the time quantum of procedure below：Gas flow is high, and is efficiently used for cleaning injection
Device, reason are that generated vacuum level is high.A further object of the present invention is to allow to be trapped in off-axis space (such as by spraying
The space that device cup and primary air define) in flow of fluid return in primary air -- this allows next wave height intensity gas stream
The fluid is removed, it had previously been trapped in the inaccessible space of injector.
From detailed description provided below, still other field of applicability of the invention will be clear understanding.Should
It is realized that detailed description and specific example, while the preferred embodiments of the present invention are indicated, it is intended to be served only for the mesh of explanation
And be not intended to limit the scope of the present invention.
Brief description of the drawings
From the detailed description and the accompanying drawings, the present invention will be more fully understood, in the accompanying drawing：
Fig. 1 is that the sectional side of the reducing agent supply unit of the part for being used as discharge program according to embodiments of the present invention regards
Figure；
Fig. 2 is that the reducing agent of the exhaust sleeve for being connected to the part as discharge program according to embodiments of the present invention is defeated
Send the side cross-sectional view of unit；
Fig. 3 is the schematic diagram of the system comprising discharge program according to embodiments of the present invention；And
Fig. 4 is the schematic diagram for showing discharge program according to embodiments of the present invention.
Embodiment
What is be substantially merely exemplary is described below to preferred embodiment, and be in no way intended to limit the present invention,
It is applied or purposes.
Reducing agent supply unit (RDU) generally is shown with 10 in figure, it has valve portion, and the valve portion is in discharge thing
Multiple vacuum formation sequences are included during part.RDU 10 includes magnetic valve fluid ejector, is generally shown with 12, it is in dosing
The spraying that the rationing function of fluid is provided in and fluid is provided into the exhaust pathway of the vehicles prepares.Cause
This, fluid ejector 12 is configured and arranged to flow in the upstream of SCR (SCR) catalytic converter and exhaust
Path is associated.Fluid ejector 12 is preferably by electrically operated magnetic valve fuel injector.Therefore, injector 12 has line
Circle 14 and moveable armature 16.
Fluid ejector 12 is arranged in interior carrier 18.By the way that the tongue of the flange 22 of body 24 is folded into carrier 18
On the shelf of screen 20, injector screen 20 is attached to carrier 18.Therefore, screen 20 is relative to injector
12 fix.Cup 28 and the inlet tube 32 integrated with cup 28 are generally included with the entrance cup structure shown in 26.Cup structure 26 with
The entrance 30 of injector 12 is in fluid communication.Inlet tube 32 connects with the source of urea liquid, and the urea liquid is supplied to spray
Emitter 12, to be sprayed from the injector of injector 12 outlet 34.Injector outlet 34 and the flange outlet 36 of injector flange 38
Fluidly connect, the injector flange 38 directly couples with the end 40 of body 24.Injector 12 also includes valve portion, and it has
Containment member 42 and valve seat 44.When coil 14 is energized, the containment member 42 of armature 16 lifts away from valve seat 44, and valve portion is moved to
Open position, so as to allow urea liquid to export 34 to flange outlet 36 through injector.When coil 14 is de-energized, spring 46
The containment member 42 of armature 16 is biased to be sealingly engaged with valve seat 44, so that valve portion returns to closed position.
Injector flange 38 includes inner surface structure, is generally shown with 48, and it limits flange outlet 36, and it is by fluid
It is transported in the exhaust sleeve 50 of exhaust flow path.Therefore, as shown in Figure 2, flange 38 is attached to the end of exhaust sleeve 50
Portion 52, and flange outlet 36 connects with the hole 54 of sleeve 50.Hole 54 connects with exhaust flow path 56.Flange 38 provides mounting spray
The mechanical bearings of emitter 12 so that tip is arranged on remote location relative to thermal exhaust.
Inner surface structure 48 also includes conical surface 58, and it is combined with least one radial surface 60.In this embodiment,
Conical surface 58 limits the open end of flange 38, and is combined with radial surface 60, and wherein radial surface 60 is directly and flange
38 packing ring shelf surface 62 combines.Therefore, conical surface 58 is in the downstream of radial surface 60.Packing ring shelf surface 62 is arranged to
It is substantially vertical relative to the longitudinal axis C of injector 12.Packing ring 64 is seated in packing ring shelf surface 62, with relative to carrier 18
Sealing flange 38.
The schematic diagram for the RDU 10 being incorporated into SCR system figure 3 illustrates.The system includes pump 70, its have with
Solenoid electric valve is in the pumping mechanism 72 being in fluid communication, and the solenoid electric valve generally shows that it is in the embodiment with 74
In be drain valve.Drain valve 74 has two parts, i.e. Part I 74A and Part II 74B.Valve 74 is led by using first
The conduit 80 of pipe 78 and second is in fluid communication with urea tank 76.3rd conduit 82 also passes in drain valve 74, the 4th conduit 84 with pressure
Fluid communication is provided between sensor 86.4th conduit 84 is also in drain valve 74 and RDU 10 to be in fluid communication.RDU 10 and row
Flow of air path 88, which is in, to be in fluid communication, and RDU 10 operation is controlled by injector driver 90.
With reference now to Fig. 3 and 4, the operation of the circulation of the emissions operation of SCR system is related to several steps.Drain valve 74 can be with
Several means configure.Figure 3 illustrates wherein Part I 74A provides the first conduit 78 and pump to first construction of drain valve 74
The fluid communication between mechanism 72 is sent, and the fluid that Part II 74B is provided between the 4th conduit 84 and pumping mechanism 72 connects
It is logical.When drain valve 74 is in the first construction, the fluid from urea tank 76 is pumped across the first conduit 78 by pumping mechanism 72
And pass through the Part I 74A of drain valve 74 so that flow of fluid passes through pumping mechanism 72, the Part II through drain valve 74
74B, through the 4th conduit 84 and RDU 10 is reached, wherein injector 12 controls the fluid being assigned in exhaust flow path 88
Amount.
Drain valve 74 also includes the second construction, and it is used during the circulation of discharge process.The first step of the circulation exists
Generally shown in Fig. 4 with 96, wherein pumping mechanism 72 operates, and drain valve 74 is changed to the second construction.Work as row
When putting valve 74 in the second construction, Part I 74A provides the fluid communication between the 3rd conduit 82 and pumping mechanism 72, and
Part II 74B provides the fluid communication between the second conduit 80 and pumping mechanism 72.When pumping mechanism 72 operates, from
Fluid is drawn to by the part 84A in the downstream of the 3rd conduit 82 and the upstream of injector 12 of the 3rd conduit 82 and the 4th conduit 84
Pumping mechanism 72, it is true so as to be generated when valve portion is in the closed position in the part 84A of the 3rd conduit 82 and the 4th conduit 84
It is empty.In the second construction of drain valve 74, pumping mechanism 72 will be inhaled from the part 84A of the 3rd conduit 82 and the 4th conduit 84
Come any fluid be pumped across the Part I 74A of drain valve 74, through pumping mechanism 72, through second of drain valve 74
Divide 74B and enter in the second conduit 80.When valve portion during the second step of the circulation shown in 98 in Fig. 4 generally to change
For open position when, the vacuum generation suction that is generated in the 3rd conduit 82 and the 4th conduit 84 and makes fluid be sucked out injection
Device 12.
During first step 96 and second step 98, pumping mechanism 72 operates, and drain valve 74 is in second
Construction.When drain valve 74 changes into the second construction to generate vacuum, the valve portion of injector 12 is maintained in its closed position.If spray
The valve portion of emitter 12 is changed into the second construction with drain valve 74 and opened simultaneously, then does not generate vacuum.
Referring again to Fig. 1-2, during RDU 10 operation, fluid is mainly assembled on the whole with the upper cavity shown in 92
In, and surround upper seal 94.Once valve portion is opened after vacuum generation, then enter through injector 12 in the 4th conduit 84
Air stream at least a portion of fluid is sucked in the 4th conduit 84 towards drain valve 74.Valve portion be moved to open position and
After injector 12 enters in the 4th conduit 84, vacuum pressure reduces air stream, until final air stream is stable and vacuum
Become minimum or be not present.
If it is desired to repeat the circulation, then valve portion is returned to closed position to generate vacuum, then valve portion is changed into and beaten
Open position, to attract more fluid to leave injector 12.Although figure 4 illustrates two circulations, the step of the circulation
96th, 98 can be repeated as many times as desired, to continue from the removing fluids of injector 12.
The alternate embodiment of the present invention is also possible.In an alternative embodiment, without using Solenoid vent valve 74, and
And pumping mechanism 72 is directly to be in fluid communication with the first conduit 78 and the 4th conduit 84.In this embodiment, led in the absence of second
The conduit 82 of pipe 80 or the 3rd, and pressure sensor 86 is only in fluid communication with the 4th conduit 84.
In this embodiment, pumping mechanism 72 has multiple operator schemes.In an operator scheme, pumping mechanism 72 with
Forward mode is operated, and fluid is sucked out from urea tank 76 through the first conduit 78, and is pumped through pumping machine
Structure 72 so that the fluid flowing in the 4th conduit 84 is pressurized.The pressure of fluid in 4th conduit 84 is by pressure sensor
86 show.Flow of fluid in 4th conduit 84 is into RDU 10, and the control of injector 12 is assigned to exhaust flow path
Amount of pressurized fluid in 88.
Pumping mechanism 72 also has another operator scheme used during discharge process, and wherein pumping mechanism 72 is with reverse
Pattern operates, and fluid is sucked out the 4th conduit 84, and is pumped mechanism 72 and is forced into the first conduit 78.Work as injector
When 12 valve portion is closed, pumping mechanism 72 is operated with countercurrent fashion, is generated vacuum in the 4th conduit 84 and RDU 10, is made
When the valve portion of proper injector 12 is opened, the fluid that is retained in upper cavity 92 is drawn out to the 4th by air stream from injector 12 and led
In pipe 84.
What description of the invention was merely exemplary in itself, therefore be intended to locate without departing substantially from the change of idea of the invention
In in the scope of the present invention.This change should not be regarded as away from the spirit and scope of the present invention.
Claims (18)
1. a kind of system for exhaust ejector, it includes：
Pumping mechanism with multiple operator schemes；
The injector being in fluid communication is in the pumping mechanism；With
As the valve portion of a part for the injector, the valve portion has open position and closed position；
Wherein, when the pumping mechanism is arranged on first operator scheme, the pumping mechanism directs pressurized fluid to described
Injector, and when the pumping mechanism is arranged on second operator scheme, in the second operator scheme, in single discharge
During circulation, the pumping mechanism generates vacuum when the valve portion is in the closed position, and the pumping mechanism exists
Fluid is guided to leave the injector when valve portion is in the open position.
2. the system as claimed in claim 1, wherein, during the single discharge cycle, the valve portion is beaten being placed on
The closed position is in before open position.
3. the system as claimed in claim 1, further comprise：
Exhaust flow path；
Wherein, the valve portion optionally changes between the open position and the closed position, with the pumping machine
When structure is in the first operator scheme, fluid is optionally directed in the exhaust flow path.
4. the system as claimed in claim 1, further comprise：
Urea tank；
Wherein, the fluid is stored in the urea in the urea tank, and when the pumping mechanism is in the described first behaviour
During operation mode, the pumping mechanism suctions out fluid from the urea tank, and the fluid is guided to the injector.
5. the system as claimed in claim 1, wherein, the valve portion be arranged on the open position up to predetermined time amount it
Afterwards, the valve portion is set back into the closed position, with when the pumping mechanism is in second operator scheme other
Vacuum is regenerated during discharge cycle.
6. the system as claimed in claim 1, wherein, it is arranged on the open position in the valve portion and obtains predetermined pressure
After level, the valve portion is set back into the closed position, with when the pumping mechanism is in second operator scheme
Vacuum is regenerated during other discharge cycle.
7. a kind of system for exhaust ejector, including：
For transmitting the pumping mechanism of fluid；
Injector；
As the valve portion of a part for the injector, the valve portion can be in open position, closed position and therebetween any
Moved between position；
The drain valve being in fluid communication is in the pumping mechanism and the injector；
Wherein, when the drain valve is arranged on the first construction, the drain valve guides pressure fluid from the pumping mechanism
To the injector, and when the drain valve is arranged on the second construction, in the described second construction, in single discharge cycle
Period, the pumping mechanism generates vacuum when the valve portion is in the closed position, and the drain valve is in the valve
Fluid is guided to the pumping mechanism from the injector when portion is in the open position.
8. being used for the system of exhaust ejector as claimed in claim 7, the drain valve further comprises：
Part I；With
It is connected to the Part II of the Part I；
Wherein, when the drain valve is in the described first construction, the pumping mechanism guiding fluid is worn from the Part I
Cross the pumping mechanism, through the Part II and reach the injector, and when the drain valve is in described second
During construction, the pumping mechanism guiding fluid through the Part I and leaves the injector through the pumping mechanism.
9. being used for the system of exhaust ejector as claimed in claim 8, further comprise：
First conduit, the Part I of itself and the drain valve are selectively in fluid communication；
Second conduit, the Part II of itself and the drain valve are selectively in fluid communication；
3rd conduit, it is in the 4th conduit is in fluid communication, and is selectively in the Part I of the drain valve
It is in fluid communication；With
4th conduit, it is in the injector is in fluid communication, and is selectively located in the Part II of the drain valve
In fluid communication；
Wherein, when the drain valve is in the described first construction, the Part I of the drain valve sets first conduit
Be set to the pumping mechanism be in be in fluid communication, and the Part II of the drain valve by the 4th conduit be arranged to
The pumping mechanism, which is in, to be in fluid communication, and when the drain valve is in the described second construction, first of the drain valve
Point the 3rd conduit is arranged to be in the pumping mechanism and be in fluid communication, and the Part II of the drain valve is by institute
The second conduit is stated to be arranged to be in fluid communication with the pumping mechanism.
10. it is used for the system of exhaust ejector as claimed in claim 7, wherein, it is arranged on the open position in the valve portion
Put up to after predetermined time amount, the valve portion be set back into the closed position, with during other discharge cycle again
Generate vacuum.
11. it is used for the system of exhaust ejector as claimed in claim 7, wherein, it is arranged on the open position in the valve portion
After putting and obtaining predetermined pressure level, the valve portion is set back into the closed position, with other discharge cycle
Period regenerates vacuum.
12. a kind of method for exhaust ejector, comprise the following steps：
Pumping mechanism is provided；
Injector is provided；
Valve portion is provided, it is a part for the injector；And
Solenoid electric valve is provided, it is in the pumping mechanism and the injector is in fluid communication；
The solenoid electric valve is arranged on the first construction, so as to the solenoid electric valve by pressure fluid from the pumping mechanism
Guiding is selectively opened the valve portion to the injector, by the fluid injection into exhaust pathway；And
The solenoid electric valve is arranged on the second construction, so as to described second construction in, during single discharge cycle, institute
State pumping mechanism and generate vacuum when the valve portion is in the closed position, when the valve portion is in an open position, by described true
Sky generation suction the solenoid electric valve is guided fluid to the pumping mechanism from the injector, and attract fluid from
Drive the injector.
13. being used for the method for exhaust ejector as claimed in claim 12, further comprise the steps：
The Part I of the part as the solenoid electric valve is provided, the Part I is in stream with the pumping mechanism
Body connects；And
A part as the solenoid electric valve is provided and is connected to the Part II of the Part I, the Part II
It is in and is in fluid communication with the pumping mechanism；
When the solenoid electric valve is in the described first construction, guiding fluid passes through the pumping machine from the Part I
Structure, through the Part II and reach the injector；
When the solenoid electric valve is in the described second construction, guiding fluid is through the Part I and passes through the pumping
The injector leaves in mechanism.
14. being used for the method for exhaust ejector as claimed in claim 13, further comprise the steps：
The first conduit is provided, the Part I of itself and the solenoid electric valve is selectively in fluid communication；
The second conduit is provided, the Part II of itself and the solenoid electric valve is selectively in fluid communication；
The 3rd conduit is provided, it is in the 4th conduit is in fluid communication, and is selected with the Part I of the solenoid electric valve
Property in be in fluid communication；And
The 4th conduit is provided, it is in the injector is in fluid communication, and is selected with the Part II of the solenoid electric valve
Selecting property it is in and is in fluid communication；
When the solenoid electric valve is arranged on first construction, the Part I of the solenoid electric valve is led described first
Pipe, which is arranged to be in the pumping mechanism, to be in fluid communication, and the Part II of the solenoid electric valve is by the 4th conduit
It is arranged to be in the pumping mechanism and is in fluid communication；
When the solenoid electric valve is arranged on second construction, the Part I of the solenoid electric valve is led the described 3rd
Pipe, which is arranged to be in the pumping mechanism, to be in fluid communication, and the Part II of the solenoid electric valve is by second conduit
It is arranged to be in the pumping mechanism and is in fluid communication.
15. being used for the method for exhaust ejector as claimed in claim 14, further comprise the steps：
Urea tank is provided, it is in first conduit and second conduit is in fluid communication；
When the solenoid electric valve is in the described first construction, fluid is transmitted through first conduit and enter the electromagnetism
In the Part I of control valve；
When the solenoid electric valve is in the described second construction, fluid is set to be transmitted through the electromagnetism control from the pumping mechanism
The Part II of valve processed, through second conduit and enter the urea tank in.
16. being used for the method for exhaust ejector as claimed in claim 12, further comprise the steps：When the electromagnetism control
When valve processed is in the described second construction, the valve portion is intermittently opened and closed, to repeatedly generate vacuum so as to generate suction
To remove excessive fluid from the injector.
17. being used for the method for exhaust ejector as claimed in claim 12, further comprise the steps：Set in the valve portion
Put after reaching predetermined time amount in open position, the valve portion is arranged on closed position, with during other discharge cycle
Regenerate vacuum.
18. being used for the method for exhaust ejector as claimed in claim 12, further comprise the steps：Set in the valve portion
After putting in open position and achieving predetermined pressure level, the valve is arranged on closed position, with other discharge
Vacuum is regenerated during circulation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/062,120 US9273581B2 (en) | 2013-10-24 | 2013-10-24 | Purge system for reductant delivery unit for a selective catalytic reduction system |
| US14/062120 | 2013-10-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104564256A CN104564256A (en) | 2015-04-29 |
| CN104564256B true CN104564256B (en) | 2018-02-23 |
Family
ID=50344237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410574581.XA Active CN104564256B (en) | 2013-10-24 | 2014-10-24 | Exhaust system for the reducing agent supply unit of selective catalytic reduction system operating |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9273581B2 (en) |
| CN (1) | CN104564256B (en) |
| DE (1) | DE102014219497A1 (en) |
| GB (1) | GB2522845A (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106574535B (en) * | 2014-08-15 | 2019-04-30 | 罗伯特·博世有限公司 | Diesel engine vent gas treatment fluid transportation system with pressure control |
| CN204827618U (en) * | 2015-04-15 | 2015-12-02 | 康明斯排放处理公司 | Integration reductant feed system |
| DE102015208509A1 (en) * | 2015-05-07 | 2016-11-10 | Robert Bosch Gmbh | Method for operating a device for injecting water into an internal combustion engine |
| DE102015217673A1 (en) | 2015-09-15 | 2017-03-16 | Continental Automotive Gmbh | Injection device for metering a fluid and motor vehicle with such an injection device |
| DE102016210262A1 (en) * | 2016-06-10 | 2017-12-14 | Robert Bosch Gmbh | A method of emptying a reductant delivery system of an SCR catalyst |
| GB2551374B (en) * | 2016-06-16 | 2019-02-06 | Delphi Int Operations Luxembourg Sarl | Method to prevent sticking of a SCR injector |
| US20190078488A1 (en) * | 2017-09-14 | 2019-03-14 | Continental Automotive Systems, Inc. | Injector for reductant delivery unit having fluid volume reduction assembly |
| US10539057B2 (en) * | 2017-09-14 | 2020-01-21 | Vitesco Technologies USA, LLC | Injector for reductant delivery unit having reduced fluid volume |
| US10502112B2 (en) * | 2017-09-14 | 2019-12-10 | Vitesco Technologies USA, LLC | Injector for reductant delivery unit having fluid volume reduction assembly |
| US11162403B2 (en) | 2017-12-13 | 2021-11-02 | Vitesco Techologies USA, LLC | Reductant dosing unit with flow variability reduction and purge improvement device |
| US10947880B2 (en) | 2018-02-01 | 2021-03-16 | Continental Powertrain USA, LLC | Injector for reductant delivery unit having fluid volume reduction assembly |
| US11041421B2 (en) * | 2018-02-01 | 2021-06-22 | Continental Powertrain USA, LLC | Injector for reductant delivery unit having fluid volume reduction assembly |
| US11008915B2 (en) | 2019-03-20 | 2021-05-18 | Caterpillar Inc. | Diesel exhaust fluid tank freeze mitigation |
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| CN102052513A (en) * | 2009-10-30 | 2011-05-11 | 博世株式会社 | Reducing agent injection valve abnormality detection device and abnormality detection method, and internal combustion engine exhaust gas purification system |
| WO2012093051A1 (en) * | 2011-01-04 | 2012-07-12 | Robert Bosch Gmbh | Pumping device for supplying an exhaust gas aftertreament system of an internal combustion engine with a reductant, and method |
| CN103097679A (en) * | 2010-07-21 | 2013-05-08 | 卡特彼勒公司 | Dosing system having recirculation heating and vacuum draining |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2134939B8 (en) * | 2007-03-30 | 2012-08-01 | Continental Automotive Systems US, Inc. | Reductant delivery unit for selective catalytic reduction |
| US20130000743A1 (en) * | 2011-06-29 | 2013-01-03 | Ti Group Automotive Systems, L.L.C. | Scr fluid distribution and circulation system |
| US8820052B2 (en) * | 2012-02-09 | 2014-09-02 | Ford Global Technologies, Llc | Liquid reductant system and method for operation of the liquid reductant system |
| US9222388B2 (en) * | 2013-02-28 | 2015-12-29 | Tenneco Automotive Operating Company Inc. | Urea common rail |
| US9334775B2 (en) * | 2013-08-16 | 2016-05-10 | Tenneco Automotive Operating Company Inc. | Water injection exhaust treatment system |
-
2013
- 2013-10-24 US US14/062,120 patent/US9273581B2/en active Active
-
2014
- 2014-01-31 GB GB1401735.4A patent/GB2522845A/en not_active Withdrawn
- 2014-09-26 DE DE201410219497 patent/DE102014219497A1/en active Pending
- 2014-10-24 CN CN201410574581.XA patent/CN104564256B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102052513A (en) * | 2009-10-30 | 2011-05-11 | 博世株式会社 | Reducing agent injection valve abnormality detection device and abnormality detection method, and internal combustion engine exhaust gas purification system |
| CN103097679A (en) * | 2010-07-21 | 2013-05-08 | 卡特彼勒公司 | Dosing system having recirculation heating and vacuum draining |
| WO2012093051A1 (en) * | 2011-01-04 | 2012-07-12 | Robert Bosch Gmbh | Pumping device for supplying an exhaust gas aftertreament system of an internal combustion engine with a reductant, and method |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102014219497A1 (en) | 2015-04-30 |
| US9273581B2 (en) | 2016-03-01 |
| US20150115051A1 (en) | 2015-04-30 |
| CN104564256A (en) | 2015-04-29 |
| GB2522845A (en) | 2015-08-12 |
| GB201401735D0 (en) | 2014-03-19 |
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